Portable power source



FIG. 1 is a front elevational view of a portable power source showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a first perspective view thereof;

FIG. 8 is a second perspective view thereof;

FIG. 9 is a third perspective view thereof; and,

FIG. 10 is an enlarged view of portion 10 in FIG. 8.

The evenly broken lines in the drawings illustrate portions of the article that form no part of the claim. The dot-dash lines shown from FIG. 8 and FIG. 10 represent the designation of enlargement views and form no part of the claimed design. 

CLAIM The ornamental design for a portable power source, as shown and described. 